Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42643618bfee630…

MALICIOUS

PDF

84.4 KB Created: 2021-05-11 08:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b99ab06684397ecb0429992a5cd7b7e0 SHA-1: 94b3b2b4464f7704bfb237b948883c120d8882f6 SHA-256: e42643618bfee63061356181735ae15da764e6f7eacdd834bda14fdd0c89433b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, many pointing to PDF files, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/strik?utm_term=dewalt+miter+saw+stand+compact+%2528dwx724%2529+silver
    • http://vengriya.space/sozazamebepampmncu.pdf
    • https://ridegagix.weebly.com/uploads/1/3/4/6/134668883/tinevivatedefibesiv.pdf
    • https://jawuzomave.weebly.com/uploads/1/3/4/6/134660074/xigiminiwo.pdf
    • http://sovetnik53.ru/lightroom_mobile_tutorialwit8p.pdf
    • https://lizakefamejoxen.weebly.com/uploads/1/3/1/3/131384135/b818c23e90a1ca.pdf
    • http://marketeuro.pro/lopofafizotxegn8.pdf
    • https://cdn-cms.f-static.net/uploads/4443804/normal_60675b96a99b0.pdf
    • https://cdn-cms.f-static.net/uploads/4373241/normal_6016bd2b30579.pdf
    • https://cdn-cms.f-static.net/uploads/4458412/normal_5fdc821ea5005.pdf
    • http://vir-tus.com/kathy_rain_ios_walkthrough5nzcx.pdf
    • https://cdn-cms.f-static.net/uploads/4481278/normal_602ba2a57dde2.pdf
    • https://cdn-cms.f-static.net/uploads/4453342/normal_603b142f3816a.pdf
    • https://mapupuvegov.weebly.com/uploads/1/3/4/7/134712300/4277850.pdf
    • http://getplafond.xyz/15129502254fvql8.pdf
    • https://cdn-cms.f-static.net/uploads/4447095/normal_606cc5bad938e.pdf
    • https://sovejugi.weebly.com/uploads/1/3/4/6/134652237/kuxogolebe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_5b60197b07994f179a1f6b4b3b032ce5.pdf?index=true
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_b6b7b3d03f964450ac5f041c9b5f4500.pdf?index=true
    • https://104e3d6a-8609-4a5f-ba89-88df40aeb326.filesusr.com/ugd/3cb22f_738f159c2c02487e8121285ba09369ad.pdf?index=true
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_9b7d1ef502d24024976475dce21ceb12.pdf?index=true
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_c0c465e807da4a08921e79754b214400.pdf?index=true
    • https://b634734f-67aa-4edc-9b69-dcf7610e4690.filesusr.com/ugd/c86859_a9a0421f1a3a4cbfb2356c899056b046.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a09.bin
9b9bbf03018a2300ec2c7e78978033758a90dc0cd1280d04360f207b923cd34c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 5892 bytes
font_01_sfnt_off00011e3d.bin
cf7a965f8cc5199ccc2eb62afeac482ad070428c67648b90fa25703167a9916e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3D 10492 bytes

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